____ nearly all behavior is learned behavior is a basic assumption of social scientists.
| A．/ | B．That | C．It is acceptable | D．When |
There is a common saying in China nothing in the world is difficult for one who sets his mind to it.
| A．that | B．which | C．where | D．whether |
The boy slipped out of the room and headed for the swimming pool without his parents' _____.
| A．command | B．conviction |
| C．consent | D．compromise |
The audience who come to the live broadcast scene are always chosen ______ in order to be fair.
| A．in general | B．by chance |
| C．on purpose | D．at random |
Our teacher recommended us so useful a grammar book ______ we can make use of while studying English.
| A．which | B．what | C．that | D．as |
—Next Monday is my birthday.
—Is that so? ______
| A．I can’t believe my ears. |
| B．I’m so glad to hear that. |
| C．What presents do you want? |
| D．Many happy returns of the day! |